I was reading about the late Neil Ardley's 1976
Jazz/Fusion album "Kaleidoscope of Rainbows" the other day and saw it
had been re-issued at some point. Can any tell me what this album
is like? I know it isn't prog as such, but I know a lot of you
people cross over into Jazz/Fusion.

This album includes a great amount of the 1970s jazz brass players and other musicians:

I've read that way back in the early 1960s, the following jazz players were part of the band: Dave Gelly, Ian Carr, Dick Heckstall Smith, Tony Reeves, Jack
Bruce, Norma Winstone, Michael Garrick, Paul Rutherford, Trevor Watts,
Art Theman, Harry Beckett and Henry Lowther.
Any thoughts on this album would be appreciated, as well as the two preceding albums also.